John Calvin Commentary Exodus 35:5

"Take ye from among you an offering unto Jehovah; whosoever is of a willing heart, let him bring it, Jehovah`s offering: gold, and silver, and brass," — Exodus 35:5 (ASV)

Take ye from among you an offering. I have introduced a passage from chapter 35, in which Moses again requires what he had before instructed; but he goes into more detail and treats at greater length the parts of the tabernacle. In the former passage he employed a verb, where he here uses a noun, “willing or voluntary of heart.” There is, however, no ambiguity in the meaning; since in both places God requires a cheerful zeal, so that they may not only contribute abundantly, but willingly. He will afterwards use a different form of expression, namely, that they did their duty, whose heart roused, or stirred them up, so as to distinguish them from the indifferent and slow (Exodus 35:21).